Tagged Questions
2
votes
1answer
42 views
How can I create a new layer from the currrent selection?
Is it possible to create a duplicate layer, only displaying the selection from the layer you are duplicating in QuantumGIS?
Simular to ArcGIS -> Create Layer from Selected Features.
I looked at "How ...
2
votes
1answer
51 views
ImportError: No module named qgis.core
I am on Ubuntu 13.04. I get the following error message -
Traceback (most recent call last):
File "analyse.py", line 1, in <module>
from log import shelve
File ...
2
votes
0answers
47 views
How to create a line layer which connects a point layer to a line layer?
In the map shown below, I have manually created the dummy lines (in green).
Using python, and without using PostGIS or sextante, I would like to automate the creation of these dummy links between a ...
1
vote
1answer
63 views
Looking for PyQGIS Syntax Examples/Guide
I am a long-time user of arcgis with intermediate experience python scripting for automation of geoprocessing workflows. I am moving towards using QGIS on the regular and I would like to dive into ...
0
votes
0answers
29 views
SEXTANTE v.to.rast.attribute issue in script
I'm trying to convert a vector layer to a raster by using the GRASS function v.to.rast.attribute in Python.
My code doesn't throw any error but the raster image is only a square of 1px. But when I'm ...
1
vote
1answer
167 views
How to add layer/raster with specific position in the QGIS layer list?
I use addRasterLayer(rast,'Name') but this adds the raster to the top.
It is possible to set position when I add raster at once? Is it possible??
2
votes
1answer
95 views
How to store attributes of a large shapefile in a list?
I am trying to store the attributes of a shapefile into a list. With following code it works for smaller shapes:
addA = []
While provider.nextFeature(feat):
attrs = feat.attributeMap()
for ...
-1
votes
0answers
58 views
add a column to table attribute in QGIS by writing a query
i try to add a column to my attribyte table by executing a query in postgresql, but i have several problems. I ask for ur help. This is the code i have tried :
from PyQt4.QtCore import *
import ...
1
vote
0answers
88 views
How to write vector layer to csv file with geometry by PYTHON?
I use Python try to write vector layer file to csv file with this code
QgsVectorFileWriter.writeAsVectorFormat(mylayer, r'c:\temp\xyz.csv', "utf-8", None, "CSV")
It can export to xyz.csv but only ...
0
votes
0answers
16 views
connexion to postgres and update attribute table of a shapfile in QGIS [duplicate]
I have created a plugin with "plugin builder" , now I search to connect my plugin to postgres. I have a shapfile and I try to find a script in Python that can use to assign a SQL query to my table ...
0
votes
1answer
51 views
Make many lines in one layer (Python)
I what to create many lines with this code:
v_layer = QgsVectorLayer("LineString", "cable", "memory")
pr = v_layer.dataProvider()
seg = QgsFeature()
...
0
votes
2answers
74 views
Python to get ids from shp dont return all records
I have some Python code to get the ids and georeference from a shapefile:
canvas = qgis.utils.iface.mapCanvas()
allLayers = canvas.layers()
nos = QgsFeature()
for i in allLayers:
if ...
0
votes
1answer
79 views
How to convert geometry of SHP to decimals
I try to create a line with two points. These points are obtained in a SHP layer.
How can i convert that points to decimals?
Thank you
0
votes
0answers
17 views
QGis non blocking notifications with pyqgis [duplicate]
I'm searching for the way to use the new QGis non blocking notification system with the QGis python wrapper. I found informations on this fonctionnality but nothing on how to use this especially with ...
0
votes
1answer
71 views
How to set Marker Line symbol for QgsVectorLayer by using Python?
QgsVectorLayer Right click->Properties->Style->Single symbol->click on simple line in tree node ->symbol layer type -> Marker line
Kindly help me to set marker line symbol programmatically by using ...
